"The fluctuations we have are dysfunctional, and I think they do harm rather than good, " he says.

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In January 2012 I was asked whether I was still taking it, after medical trials showed that for those without a history of heart disease or stroke, aspirin was more likely to do harm rather than good.

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She said they ought to look at "really clear programmes that make a difference" rather than informal parenting lessons that "could do more harm than good".

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